TRF371109: TRF371109 parallel external gain control.

hui Chen

Part Number: TRF371109

I am using TRF371109 in my new design, I want to just use SPI to control the PGA gain, then how do I deal with the parallel external control pins(Gain_B0 ，Gain_B1，Gain_B2 )?

Can these three pins be left NC(No connect) if no use?

Regards

over 3 years ago

0 Kang Hsia over 3 years ago

TI__Guru 66004 points

Hi,

The parallel external control pin can be optional to the SPI control. This is described in the GAIN CONTROL section on page 35 of the datasheet.

Please set register 1, bit 27 ENFASTGAIN to 0 so external control pins are ignored.

-Kang

0 hui Chen over 3 years ago in reply to Kang Hsia

Intellectual 450 points

Thanks, I prefer to remove the all of external resistors. :)

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TRF371109: TRF371109 parallel external gain control.